Machine for polishing pencils and other rod-shaped bodies



. 1,640,910 Aug. 3 1927' H. scHwANHKussER ET MACHINE FOR POLISHING PENCILS AND OTHER ROD SHAPED BODIES Filed June a. 1926 2 Sheets-Sheet 1 Aug. 30, 1927. 1,640,910

H. scHwANHKussER ET AL MACHINE FOR POLISHING PENCILS AND OTHER ROD SHAPED BODIES Filed June 8,1926 2 Sheets-Sheet 2 ZMLMJW Patented Aug. 30, 1927.

UNITED STATES PATENT OFFICE.

OF MUNICH,

GERMANY.

MACHINE FOR ronrsi-rme PENoILs AND OTHER Ron-SHAPED BODIES.

Application fil ed June 8, 1926, Serial No.

L For polishing pencils and other rod-shaped bodies one proceeds in such a manner that the pencils are either polished in a 'carriage which executes a reciprocating movement underneath a polishing pad, or that the pencils are pushed the one after the other froma charging hopper by means of a ram througha reservoir containing liquid polish and then deposited ,for' drying upon two endless conveyor-bands on which they rest at both ends to be conveyed oyer adistance of several meters. At the end of this drying-path the pencils are removed by hand and placed into boxes to be carried back to the charging-hopper. into which they are fed againto be passed through the polishing process. According to another polishing method the pencils are placed upon a horizontal annular disk and deposited, after a predetermined part-rotationof said disk, into a boX to be carried back by hand to the charging-hopper. V V V V I The invention has for its object, to make any work by hand unnecessary,and to carry out automatically the removing of the pencils as well as the conveying back int'o the charging hopper. With this object in view a mechanism is arranged at the end of the drying pathwhich is designed to receive a certain number of pencils and to transfer the same upon a conveyor band which conveys the pencils back to the charging hOpper.

An improved machine for polishing pencils, comprising a charging-hopper, a reservoir for liquid polish and a eonveying band for drying is shown, by way of example, in the accompanying drawing in which F ig. 1 shows in side elevation the machine with theimpro vement according to the invention. 7 I

Fig. 2 is a plan view of Fig. 1. Y Fig. 3 show' in rear elevation and on larger scale the conveyingand elevatingmechanism. Y s k Fig. 4 is aside elevation of Fig. 3. u

The pencils to be polished are inserted into a charging-hopper l and fed by means of a rain '2 between two conveyor rollers 3 114,5 2 3 and in Germany August 21, 1925.

which push the pencils through a reservoir 4 containing the liquid polish. The pencils are then deposited, head forward, upon the slowly moving endless conveying bands 5 arranged at a certain distance the one from the other and guided over pulleys 6, 7.

These conveying bands are generally several meters long. The polishing machine which has just been described is commonly used. The novelty consists in arranging, behind the pulleys 7 of the conveyor bands 5 a con- Veyingand elevatingimechanism which is shown in Figs. Band 4 in detail and which is designed to convey the pencils to an endless band 8 situated above the drying bands and toconvey the pencils back to the chargi -happ n i Theelevating mechanism consists of two arm crosses 9, 9. On the end of each arma bucket 11 is suspended so that they can oscillate, said bucket being maintained in liori zontal position by counter-weights 10.

These buckets 11 are of such width that they can just pass between the conveyorbands 5'. I At the point over which the buckets pass stationary strippers 12 are arranged above the conveying bands 5, by

which strippers the pencils which, ow'ing to the drying of the liquid polish, stick more orles's strongly on the conveyor-bands, are

loosened andi adjusted parallel to one another-owing to the progressing movement of the drying bands. I I

In the circle alongwhich the buckets move, a discharging-element consisting of two angular sheet-1netal plates 14, 1 4 spaced the one from the other of the width'of the buckets 11, circulates above the horizontal position of the arms 9. The angular sheet metal plates 14, 14 are suspended by means of pivot pins 17 each on an arm 16 keyed on a shaft 17, said sheet metal-plates 14, 14 being permanently heldin vertical position by the action of counterweights 18. The elements 14 do not rotate individually but they are rotated in vertical position by the arms 16 aroundthe aXle15 The elements 14 move at greater speed than the buckets liquid polish.

11 so that they remove the pencils from the bucket when passing. over same. The shaft 15 is driven from a crossed belt-driving gear 19, 20, 21, the driving pulley 19 of which is keyed on a shaft 22 of the rear pulleys 7, 7 for the conveying bands 5, 5.

On the shaft 17 a spur wheel 23 (Fig. 6) is further keyed which gears with a toothed wheel 24 keyed on the axle 25 of the arm crosses so that said arm crosses are rotated. Within the range of the discharging element 14, 14 descending from the extreme upper position downwards in the direction of rotation indicated, a sheet metal plate '26 arranged between said two dischargingshovels engages between the same and grips at the descending movement of the arms 16 the pencils on the discharging-shovel and brings the same downwards to deposit the same upon the conveyor band guided over pulleys 27.

' The operation of the mechanism is as follows p The pencils inserted into the charginghopper 1 are pushed through the liquid polish in the reservoir 4 by the action of the ram 2 and by means of the rollers 3 and after having been coated with liquid polish the pencils are deposited upon the conveyor bands 5 at intervals of 35 cm. in accordance with the speed at which the conveyor bands move. The pencils striking against the strippers 12 are loosened from the conveyor bands, if they stick on the same, and directed so that they are parallel the one to the other. If about 14 to 16 pencils have collected at the strippers they are dropped into one of the buckets 11 coming from below and taken along. If the corresponding arm 9 is in a position inclined approximately the pencils in the bucket 11 are caught by the dischargingelements 14 and lifted out of the buckets, as the discharging elements move ahead of said buckets. At the descending of the discharging elements 14, 14 the pencils are deposited upon the sheet metal plate 26 which carries the same to the conveying band 8 to be conveyed again to the charging-hopper. As the outer surface of the discharging-elements 14 moves at this occasion along the pencils lying upon the discharging sheet metal plate they are accordingly adjusted.

The polishing process is finished as soon as the surface of the pencils has been suiiiciently covered by repeated coating with The number of passages of the pencils through the liquid polish depends on their covering capability. After a sufficiently thick coating has been produced the pencils are removed by hand from the top conveyor band.

As the amount of power, necessary for removing and elevating of the pencils and for the conveying of the same back to the back to said charging-hopper.

arranged at the points at whichthe pencils were up to the present deposited into the box, a conveyor band or the like, leading from the. grippingand elevating mechanism to the charging hopper, being provided.

We claim: I 1. l\iachine for polishing pencils'and other rod-shaped bodies, comprising in combination a reservoir for liquid polish, a charg ing-hopper in front of said reservoir, conveying bands for drying arranged behind said reservoir, a. gripping and elevatingmechanism arranged behind said conveyor bands, and a delivering'conveyor band between said grippingand elevating mechanism and said charging-hopper so that, at the end of the drying path one or several pencils are gripped by said grippingand elevating mechanism and deposited. upon said delivering conveying band to be brought Machine for polishing pencils and other rod-shaped bodies, comprising in combination a reservoir for liquid polish,.a charging-hopper in front of said reservoir, conveying bands for drying arranged behind said reservoir, strippers at the end of the drying path for loosening the pencils from.

said conveyor-bands for adjusting the same parallel to one another and for collecting a certain number of pencils, agrippingand elevating-mechanism arranged behind said strippers, and a delivering conveyor band between said grippingand elevating-mechanism and said charging-hopper so that, at the end of the drying path one or several pencils are gripped by said grippingand elevating mechanism and deposited upon said delivering conveying band to be brought back to said charging-hopper.

3. Machine for polishing pencils and other rod-shaped bodies, comprising in combinationa reservoir for liquid polish, a charginghopper in front of said reservoir, conveying bands for drying arranged behind'said reservoir, strippers at the end of the drying path for loosening the pencils from said conveyorbands for adjusting the same parallel to one another and for collecting a certain number of pencils, a grippingand elevating-mechanism arranged behind said strippers, said mechanism consisting of two rotatable arm crosses, buckets oscillatably suspended at the ends of the arms, counterweights for maintaining said buckets in the horizontal position, discharging-elements mounted in'the path of said buckets for lifting the pencils out of said buckets, an inclined sheet metal plate between said discharging-elements, and a delivering conveyor band between said grippingand elevating-mechanism and said charging-hopper so that, at the end of the drying path one or several pencils are gripped by said grippingand elevating mechanism and deposited by said inclined plate upon said delivering conveying band to be brought back.to said charging-hopper. 10

In testimony whereof We afiix our signatures.

HERBERT soHWANHAUssER. WALDEMAR soHWANHAUssER. 

